ksmbd: fix use-after-free in smb_lazy_parent_lease_break_close()

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commit eac3361e3d upstream.

opinfo pointer obtained via rcu_dereference(fp->f_opinfo) is being
accessed after rcu_read_unlock() has been called. This creates a
race condition where the memory could be freed by a concurrent
writer between the unlock and the subsequent pointer dereferences
(opinfo->is_lease, etc.), leading to a use-after-free.

Fixes: 5fb282ba4f ("ksmbd: fix possible null-deref in smb_lazy_parent_lease_break_close")
Cc: stable@vger.kernel.org
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Namjae Jeon 2026-03-02 12:55:02 +09:00 • committed by Greg Kroah-Hartman

parent 146691daf2

commit dbbd328cf5

1 changed files with 4 additions and 2 deletions

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fs/smb/server/oplock.c

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